EP 0455974 A3 19920902 - CONTROL CIRCUIT FOR A SUPERHETERODYNE RECEIVER
Title (en)
CONTROL CIRCUIT FOR A SUPERHETERODYNE RECEIVER
Publication
Application
Priority
DE 4011650 A 19900411
Abstract (en)
[origin: EP0455974A2] A control circuit for an electronically adjustable input stage (2) of a superheterodyne receiver comprising a processor (21) is to ensure a useful-signal/noise-signal ratio which is most advantageous in the respective receiving situation. For this purpose, at least two level meters (16, 17 and 18, respectively) are provided in the signal path. The processor (21) controls an attenuating section (11). With a level at the front level meter (16) which is high with respect to the level at a rear level meter (17 and, respectively, 18), it sets an attenuation at the attenuation section (11) of such a magnitude that an advantageous useful-signal/noise-signal ratio is obtained. When the levels are approximately identical, it reduces the attenuation of the attenuation section (11). <IMAGE>
IPC 1-7
IPC 8 full level
H03G 3/20 (2006.01); H03J 3/24 (2006.01); H04B 1/10 (2006.01); H04B 1/14 (2006.01)
CPC (source: EP)
H03G 3/3068 (2013.01); H03J 3/24 (2013.01); H04B 1/1027 (2013.01); H04B 1/14 (2013.01)
Citation (search report)
- [X] DE 2914092 A1 19801009 - ROHDE & SCHWARZ
- [A] US 3473128 A 19691014 - KISER JOSEPH H
Designated contracting state (EPC)
ES FR GB IT
DOCDB simple family (publication)
EP 0455974 A2 19911113; EP 0455974 A3 19920902; DE 4011650 A1 19911017
DOCDB simple family (application)
EP 91104587 A 19910323; DE 4011650 A 19900411